Machine for brushing flat surfaces



Sept. 6, 1960 L. c. COLE ETAL MACHINE FOR BRUSHI'NG FLAT SURFACES l1 Sheets-Sheet 1 Filed July 22, 1957 INVENTORS. LYNDON 0. 001.5 a BYEDWIN H. BRAUER, JR.

9% {ilk/22mm ATTORNEYS L. C. COLE ET AL MACHINE FOR BRUSHING FLAT SURFACES Sept. 6, 1960 m s 2 n" U a um m e N h B0 A 0 w N @c an a on A m N w W E J mm 1 ummo...

Filed July 22, 1957 L. c. COLE ETAL MACHINE FOR snusnmc FLAT SURFACES Sept. 6, 1960 Filed July 22, 1957 11 Sheets-Sheet 3 INVENTORS LYNDON c. COLE a H. BRAUER, JR.

' (mm/L ATTORNEYS EDWIN Sept. 6, 1960 L. c. COLE EFAL MACHINE FOR BRUSHING FLAT SURFACES 11 Sheets-Sheet 4 Filed July 22, 1957 INVENTORS. LYNDON c. com; a EDWIN H. BRAUER, JR.

ATTORNEYS Sept. 6, 1960 MACHINE FOR BRUSHI NG FLAT SURFACES Filed July 22, 1957 ll Sheets-Sheet 5 FIG. 6

- INVENTORS. LYNDON C. COLE 8 BY EDWIN H. BRAUER, JR.

(9% oZ'mMc/u ATTORNEYS L. c. COLE ETAL 2,951,254

MACHINE FOR BRUSHING FLAT SURFACES Filed July 22, 1957 11 Sheets-Sheet 6 FIG. 7

INVENTORS- LYNDON C. COLE 8 gowm H. BRAUER, JR.

0mg {mm ATTORNEYS Sept. 6, 193% c. COLE ETAL 2,951,254

MACHINE FOR BRUSHING FLAT SURFACES Filed July 22, 1957- 11 Sheets-Sheet 'r LYNDON C. EDWIN H. BRAUEFL'JR.

ATTORNEYS L. C. COLE ET AL MACHINE FOR BRUSHING FLAT SURFACES Sept. 6, 1960 11 Sheets-Sheet 8 Filed July 22, 1957 FIG. 9

INVENTORS. LYNDON c. COLE a BYEDWIN H. BRAUER, JR.

ATTORNEYS Sept. 6, 1960 L. C. COLE ET AL MACHINE FOR BRUSHI NG FLAT SURFACES 11 Sheets-Sheet 9 Filed Jul 22, 1957 m ..v s 0 Y TER E N E N E U Z VOA 0 W W 6 T M 0m FIG; |0

Sept. 6, 1960 L. c. COLE EI'AL 2,951,254

MACHINE FOR BRUSHING FLAT SURFACES Filed July 22, 1957 '11 Sheets-Sheet 1o INVENTORS. LYNDON c. COLE a. V Y EDWIN BRAUER, JR.

a e/La e 56mm k AT'LORNEYS LI C. COLE EI'AL MACHINE FOR BRUSHING FLAT SURFACES Sept. 6, 1960 ll Shets-Sheet 11 Filed July 22, 1957 Q a A 2mm .C l a F N o D N w gpwm H. BRAUERXJR.

GMQ ZM FIG- l2 ATTORNEYS MACHINE son BRUSHING FLAT SURFACES Lyndon C. Cole, Shaker Heights, and Edwin H. Brauer,

J12, Cleveland, Ohio, assignors to The Osborn Manufacturing Company, Cleveland, Ohio, a corporation of Ohio Filed July 22, 1957, Ser. No. 673,278

Claims. (Cl. 15--21).

The present invention relatesgenerally as indicated to a machine for brushing flat surfaces, and more particularly, to a machine that is equipped with a rotary powerdriven cylindrical brush or the like, adapted to be brought into contact with surfaces to be brushed whether for cleaning, polishing, bufling, or other surface beneficiating effect.

In the art of polishing the fiat surfaces of plate glass, for example, it is one prevalent practice to uniformly support a piece of plate glass upon a flat table with an intervening layer of plaster of Paris or equivalent composition between the glass and the table, while the polishing operation is performed on the top exposed surface of the glass. Following the polishing operation it is desirable, or necessary, to remove the plaster of Paris layer from the table preparatory'to the application of a new layer, but without disturbing the flatness of the top surface of the table. The instant machine is well suited for that purpose, that is, the removal of the plaster of Paris from the table top, and in the preferred embodiment of this machine, the longitudinal axis of the rotary brush is skewed with respect to the rectilinear path form pressure contact between the brush throughout its length with the table top.

In this application of the machine and in numerous others, such as the cleaning, polishing, bufling or other surface conditioning operations on sheet or plate stock, it is imperative, in order to achieve uniform results, to make provision for accurate adjustment of the brush with respect to the surface of the work being operated upon so as to maintain uniform contact pressure between the brush periphery and the work throughout the length of the brush despite wearing of the latter.

In brushing machines of the type with which the present invention is concerned, the brushes are of axial length such that it is not feasible to provide a cantilever mount ing thereof. Accordingly, the arbor upon which the brush is mounted is supported in bearings at both ends. Moreover, because the profile of the rotary brush may become worn to somewhat conical profile, provision should be made for adjustment of the bearing at one end of the arbor with respect to the bearing at the other end for establishing uniform contact between the brush and the surface of the work which is being brushed.

Accordingly, it is one principal object of this invention to provide a brushing machine in which both ends of the brush mounting arbor are rotatably supported in bearings that are adjustable simultaneously to move the brush closer to or farther away from, the surface of the work to be brushed.

It is another object of this machine to provide a brushing machine in which power-driven adjusting means are effective to simultaneously adjustably move the bearings for the respective ends of the brush-arbor assembly.

It is yet another object of this invention to provide a 2 brushing machine in which the hearing at one end of the brush arbor is adjustable with respect to the bearing at the other end of the brush arbor so as to compensate for wear of the brush to slightly conical profile.

It is yet another object of this invention to provide a brushing machine in which the simultaneous adjustment of the bearings at the ends of the'brush arbor may be effected irrespective of whether or not the brush isat that time being driven.

It is still another object of this invention to provide a brushing machine in which adjustment of the bearing at one end of thebrush arbor with respect'to the bearing at the other end of thebrush arbor may'beeffected while the machine is in operation.

It is still another object of this invention to provide a brushing machine which makes possible easy and quick replacement of a worn brush with a new one.

It is still another object of this invention to provide a brushing machine which includes spaced-apart bearing stands with a brush-arbor assembly extending thereacross claims, the following description and the annexed drawings setting forth in detail a certain illustrative embodiment of the invention, this being indicative, however, of but one of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. l is a perspective view of one embodiment of the invention as viewed angularly from the front and one side of the machine;

Fig. 2 is a front elevation view taken on the line 2-2 on Fig. 3 of the brushing machine shown in Fig. 1 wherefrom is evident the skewed mounting of the brush with respect to the direction of feed of the Work (shown in dot-dash lines), the feed of the work being in a horizontal plane and in a direction perpendicular to the plane; of the sheet on which the drawing is made;

Fig. 3 is a top plan view of the present brushing machine, as viewed from the top of Fig. 2, and again: showing the skewed mounting of the brush and of the: bearing stands at each end;

Fig. 4 is an end elevation view as viewed along the line 44, Fig. 3;

Fig. 5 is a top plan view, partly broken away, on somewhat enlarged scale, showing the brush-arbor assembly, the journal boxes for the ends of the arbor, and the: means for driving the brush;

Fig. 6 is a cross-section view in a vertical plane, such cross-section having been taken substantially along the longitudinal axis of the brush-arbor assembly and jour-- nal boxes as represented by the line 6-6, Fig. 3;

Fig. 7 is a front elevation view as viewed along the line 7-7, Fig. 3, of the right-hand one of the bearing; stands on which the brush drive means is carried;

Fig. 8 is a vertical cross-sectionview taken substantially along the line 8--8, Fig. 6, illustrating the means for vertically adjusting the journal box at that end of the brush arbor;

Fig. 9 is a front elevation view, partly in cross-section,

0 as viewed along the line 9-9, Fig. 3, showing the idler section having been taken substantially along the line 10--10, Fig. 3;

Fig. 11 in a cross-section view, on enlarged scale, taken substantially in a horizontal plane as designated by the line 11 11, Fig. 7;

Fig. 12 is a cross-section view of the clutch actuating lever as viewed along the line 12-12, Fig. 11;

Fig. 12A is a bottom plan view taken along line 12A 12A, Fig. 11; and

Fig. 13 is a cross-section view taken substantially in a horizontal plane as designated by the line 1313, Fig. 10.

Basically, and as best shown in Fig. 1, the brushing machine herein comprises a rotary cylindrical brush I mounted on an arbor 2 that has its ends rotatably supported in journal boxes 3 and 4. The journal boxes 3 and 4 are vertically adjustably mounted in spaced-apart bearing stands 5 and 6, one of which, namely the stand 5 at the right-hand side of Fig. 1, is provided with means 7 for driving the arbor 2. Extending across the upper ends of the bearing stands 5 and 6 is a cross-beam 8 which. functions not only to tie together said stands but additionally as a jack shaft housing, which jack shaft, as will hereinafter appear, is operative to interconnect the bearing adjusting mechanisms in the respective bearing stands 5 and 6 for simultaneous actuation. v

Having thus briefly outlined the basic construction of the machine, the same will now be described in detail under the following headings:

I. Brush-arbor assembly and drive therefor;

II. Bearings for journaling the brush;

III. Vertical adjustment of the bearings or journal boxes;

IV. Mechanism for effecting simultaneous power adjust ment of the journal boxes;

' V. Mechanism for independent adjustment of one journal box with respect to the other; and VI. Automatic compensation for brush wear I. Brush-arbor assembly and drive means therefor The brush-arbor assembly and drive therefor is shown in nearly every figure of the drawings, but is shown in detail especially in Figs. 5 and 6.

The arbor 2 is preferably made up of a main tubular section 10 to which end pieces 11 and 12 are secured as by welding or like expedient, the section 10 being provided with a collar 14 against which one end of the rotary cylindrical brush 1 is clamped as by means of a clamping sleeve 15 which engages the other end. The sleeve 15 is urged toward the collar 14 by an arbor nut 16 that is threaded onto the end piece 12, the nut 16 being locked in place as by means of the locking screw 17 which draws together those portions of the nut which are disposed on opposite sides of a transaxial slot 18 formed in the nut.

The rotary cylindrical brush 1 may be of any familiar form and for the purposes on hand, said brush may comprise radially extending bristles as of steel wire which define a brush of generally cylindrical profile.

As best shown in Figs. 2 and 3, there is provided a hinged brush cover 20 that fits over the brush 1, leaving only the underside thereof exposed for contact with the work to be brushed.

The end 11 of the arbor 2 extends through journal box 3 and has keyed thereon a pulley 21 over which, and over the drive pulley 23 of electric drive motor 7, is trained a flexible drive belt 24. The drive motor 7 (see Fig. 8) is mounted on a rearwardly extending platform 25 of the bearing stand 5, said stand being hereinafter referred to as the drive stand)? whereas the other bearing stand 6 is hereinafter referred to as the idler stan The ends of the" arbor 2 are rotatably supported in journal boxes 3 and 4 that are vertically reciprocably mounted in the respective drive and idler stands 5 and 6.

As will be seen later, the arbor 2 and the axis of motor 7 are preferably at approximately the same level whereby vertical adjusting movement of the journal boxes 3 and 4 involves a minimum amount of stretching of the belt 24.

While herein a single flat belt 24 has been shown, it is to be understood that other familiar forms of drives may be employed such as, for example, V-belts trained over multiple groove sheaves. A belt guard 26 is provided around the belt 24 and around pulleys 21 and 23.

II. Bearings for journaling the brush Each end of the arbor 2 has mounted thereon a pair of relatively widely spaced-apart anti-friction bearings 31 (see Fig. 6), for instance, tapered roller bearings, which bearings have their outer races fitted in a spherical journal 32. The journals 32 each have a spherical exterior surface that fits in a complementary concave spherical surface formed in the respective journal boxes 3 and 4. As shown, each journal 32 has a clearance with the journal boxes 3 and 4. Accordingly, one journal box, herein the journal box 3, may be vertically adjusted with respect to the other journal box 4 in the event that the brush 1 becomes worn to conical profile. By such adjustment, the slant height elements of the brush 11 may be positioned so as to be parallel to the surface being worked upon and thus make uniform pressure contact therewith from one end to the other of the brush 1. Between the journal boxes 3 and 4 and the respective journals 32 are resiliently deformable sealing rings 34 as of rubber, felt, leather, or the like, which are resiliently deformable to permit the relative vertical adjustment as just explained and to serve as lubricant seals.

In the present embodiment of the invention the journals 32 and the respective journal boxes 3 and 4 are formed with complementary grease grooves, and as customary in the art of bearing lubrication, other small grooves may be formed in the concave spherical surfaces of the journal boxes 3 and 4 and/or on the exterior spherical surfaces of the respective journals 32. Preferably, the journals 32 are held against rotation by pins 35 that loosely fit in recesses formed in the respective boxes 3 and 4.

The journal boxes 3 and 4 each includes a journal housing 40 and a journal cap 41, the latter being hinged on pin 42 so that it may be swung open for ready removal of the brush 1 and arbor 2 assembly upon removal of the drive belt 24 from the pulley 21. The joint between the cap 41 and journal housing 40 is on a bias as shown so as to facilitate removal of the brusharbor assembly and also better to handle the oblique loading which may be encountered during operation of the machine.

For quick opening of each journal cap 41, each journal housing 40 has pivotally mounted thereon, about an axis parallel to the bearing, a pair of eye-bolts 43 which are swingable to engage in slots formed in the edge of the cap opposite the hinge pin 42 thereof. Nuts 46 threaded on said eye-bolts 43 are effective to clamp the cap 41 against the housing 40, and when it is desired to swing the cap 41 to open position, the nuts 46 are merely loosened a turn or two whereupon the eye-bolts 43 may be swung clear of the cap-41.

I II. Vertical adjustment of the bearings or journal boxes 5 which has threaded engagement with a vertically disposed adjusting screw 56. Each screw 56 is rotatably, but axially fixedly, mounted in the respective stands 5 and 6. Ac-

cordingly, when said screws 56 are rotated in one direction or the other, the journal boxes 3 and 4 are moved upwardly or downwardly along the bars 49.

The nut assembly 54 may be provided with a dependent dust cup 59 to prevent dirt from getting on the threads of said screw 56 and likewise a bellows or accordion-type dust seal sleeve 58 is disposed around the screw 56 to protect the threads from foreign matter. This is best shown in Fig. 8.

-IV. Mechanism for efiecting simultaneous power adjustment of the bearings or journal boxes ,The mechanism for simultaneously vertically adjusting the journal boxes 3 and 4 comprises a reversible electric drive motor 60 mounted on the gear box 61 at the upper rear portion of. the drive stand 5 (see Figs. 8 and 11), the motor 60 having its drive shaft 62 connected by coupling 63 to,the shaft of a pinion gear 64 journaled in the gear box 61.

In the present case, the gear box 61 has journaled therein a series of three spur gears 64, 65, and 66 meshthrough a clutch whichcomprises a fixed element 71 mounted on the shaft of bevel gear 69 and a movable element 72 axially slidably keyed on the worm shaft 70. The worm shaft 7 has a worm 73 thereon which engages the worm wheel 74 secured on the upper end of the adjusting screw 56, whereby the screw 56 .is rotated in one direction or the other when motor 60 is energized and when the clutch elements 71 and 72 are engaged by shifting of clutch element 72 upwardly as viewd in Fig. 11.

As previously mentioned, the cross-beam 8 serves to connect together the upper portions of the respective stands and 6 and also constitutes a housing for the jack shaft 67. The cross-beam 8 mounts a bearing 75 (see Figs. and 13) for the jack shaft 67 adjacent the idler stand 6. Mounted on the upper rear portion of the idler stand is a gear box 76 journaling the meshing bevel gears 78 and 79 therein, the bevel gear 78 having its shaft connected to jack shaft 67 throughcoupling 80, and the bevel gear 79 having its shaft keyed to worm shaft 81. A worm 73 on shaft 81 meshes with a worm wheel 74 mounted on adjusting screw 56. The front end of the worm shaft 81 is rotatably supported in a bushing or the like, contained in a removable plate 32 at the front of the idler stand 6.

As can now be seen, when the drive motor 60 is energized and when the clutch elements 71 and 72 are engaged, both adjusting screws 56 will be driven simultaneously through the worm 73-worm Wheel 74 drive.

V. Mechanism for independent adjustment of one journal box with respect to the other As best shown in Figs. 11 and 12, the worm shaft 70 has its front end journaled in a bushing fitted in the removable plate 85 mounted on the front of the drive stand 5 and has a polygonal end 86 that extends through the plate 85 for turning as with a suitable crank or the like (not shown) when the cover plate 87 is swung out of the way.

Manual rotation of the worm shaft 70 in opposite directions as just described can be effected when the clutch elements 71 and 72, are disengaged from each other. Such turning of the worm shaft 70 as by a crank engaged with the polygonal end turns the adjusting screw 56 through the worm 73-worm wheel 74 drive. In this way, the journal box 3 may be adjusted upwardly or downwardly with respect to the journal box 4 so as to efiect uniform pressure contact between the brush 1 and the work surface being brushed despite wearing of the brush to slightly conical profile.

The clutch disengaging means may comprise a clutch lever 90 provided with rollers 91 engaged in a groove 92 formed in the movable clutch element 72, said movable clutch element being axially slidably keyed on the worm shaft. The clutch lever shaft 93 is rockably mounted in the drive stand 5 and has keyed thereon a bevel gear 94 which meshes with a bevel gear 95, the latter being secured on the rear end of a forwardly extending shaft 96 that terminates at the front of the drive stand 5. The shaft 96 is turned in either direction to swing lever 90 to engage the clutch or to disengage the clutch as by means of a handle 97 thereon which is equipped with a spring-loaded detent pin 98, the end of the pin being engaged in one or the other of two recesses 99 and formed in a plate or boss disposed at the front of the drive stand 5. The detent pin 98 is laterally enlarged to provide a knob 101 by which the pin is pulled out of one recess 99 or 100 when it is desired to swing the handle 97 to the other position whereat the detent pin 98 pops into the other recess 100 or 99 to hold the clutch in either engaged or disengaged position, as the case may be.

If desired, there may be mounted on the drive stand 5 for operation by the handle 97 a switch or the like, which will deenergize the drive motor 60 when the clutch ele ment 72 is disengaged from clutch element 71 and thus prevent vertical adjustment of the journal box 4 in the idler stand 6 at the time that manual adjustment of journal box 3 is to be made.

It is to be noted that whether the journal boxes 3 and 4 are being adjusted simultaneously through operation of the reversible drive motor 65, or the journal box 3 in the drive stand 5 is being independently manually adjusted by turning of worm shaft 70 while the clutch elements 71 and 72 are disengaged, the brush 1 may be driven or not at that time.

V1. Automatic compensation for brush wear The simultaneous vertical adjustment of the journal boxes 3 and 4 may be accomplished simply by providing at an accessible place on one of the stands 5 or 6, preferably on the drive stand 5, a reversing switch (not shown) with two buttons, one marked-up and the other marked down which serve to control the direction of operation of the reversible drive motor 60. Thus, the operator of the machine may run the journal boxes 3 and 4 and the brush l-arbor 2 assembly journaled therein up or down as desired to bring the brush 1 to proper working level with respect to the work surfaces to be brushed.

Of course, overload devices may be installed to deenergize the reversible drive motor 60 should the operator inadvertently hold the down button too long.

It is further contemplated to provide for automatic wear compensation of the brush 1 by automatically moving the journal boxes 3 and 4 simultaneously downward as the brush 1 wears. In this way it is possible to obtain uniform surface conditioning of the work surfaces. Should the brush 1 wear down to slightly conical profile it is a simple matter to make the necessary manual adjustment by disengaging the clutch elements 71 and 72 and manually rotating the worm shaft 70 to raise or lower the drive stand journal box '3 as necessary to bring the brush 1 into uniform pressure contact with the work surface.

There are many ways of accomplishing automatic control of the reversible drive motor 60, one being the provision of a current-responsive unit mounted in the power line for the brush drive motor 7 effective, when the current draw of the brush drive motor 7 drops down to a predetermined minimum value due to insuflicient contact pressure between the brush 1 and the work surface, to energize the reversible drive motor 60 in that direction which causes the journal boxes 3 and 4 to be moved downwardly and thereby increase the contact pressure between the brush 1 and the work surface. When the current draw of said brush drive motor 7 reaches a predetermined maximum'value which corresponds to the desired contact pressure between the brush 1 and the work, the unit aforesaid will be effective to deenergize the reversible motor 60. There are numerous other schemes for achieving such automatic compensation for wear and these need not be gone into in the present application except to state in a general way'that controls for the reversible motor 68 may be responsive or sensitive to light, to build-up of fluid pressure, to brush speed, or to mechanical feeler devices that move the brush 1 down according to the progressively decreasing diameter of the brush 1 as it wears.

In any of these schemes the automatic compensator takes care of simultaneously moving the journal boxes 3 and 4 and brush-arbor assembly downwardly and, of course, in the case of uneven wear, such as would cause the brush profile to become slightly conical, the clutch elements 71 and 72 may be disengaged and the worm shaft 70 rotated manually to bring the bottom side of the brush to a position parallel to the work surface.

The drive and idler stands 5 and 6 when viewed from the top as in Fig. 3 are in the form of parallelograms of which the inner sides are vertical and extend parallel to the direction of feed of the work, the axis of the brush 1 being skewed with respect to the direction of feed of the work. It has been found desirable in brushing operations, as herein, to so locate the brush 1 with respect to the direction of feed of the material being brushed because a longer brush may be used. Moreover, the load on the work feed devce is gradually applied since initially the brush 1 contacts the corner of the work surface and, as the work is fed longitudinally under the brush 1, a progressively increasing portion of the length of the brush contacts the work surface.

Broadly stated, the present brushing machine comprises a power-driven rotary cylindrical brush with which a work surface to be brushed is contacted as the work is lineallyfed along a path that is tangent to a circle of diameter less than the diameter of the brush, the ends of the brush arbor being journalled in bearings laterally adjustably supported in bearing stands. One characterizing feature of this machine is that provision has been made for simultaneously adjusting the bearings and thereby moving the brush closer to the work surface being brushed so as to achieve uniform results despite wearing of the brush.

Another characterizing feature of this machine is that one bearing may be adjusted independently of the other to effect uniform contact of the brush with the work surface despite wearing of the brush to slightly conical profile, this being made possible by providing complementary spherical bearing surfaces that, in effect, form a ball joint or universal joint between the bearings and the ends of the brush arbor.

Furthermore, the machine herein disclosed is compact in that the bearing stands are of generally parallelogram form in top plan view and additionally the outline of the floor area occupied by the machine as a whole is essentially a parallelogram. Also contributing to such compactness of the machine is the formation of the bearing stands with inset front portions for accommodating the v bearing guides.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims, or the equivalent of such, be employed.

We therefore particularly point out and distinctly claim as our invention:

1. A brushing machine comprising a pair of upright bearing stands each provided with a split bearing; a rotary brush and arbor assembly having the ends of the arbor thereof journalled in the respective bearings; power drive means detachably connected with said arbor whereby, upon opening of said bearings and detachment of said drive means from said arbor, said assembly may be removed from said machine; means for simultaneously vertically adjusting said bearings irrespective of whether or not said assembly is driven by said power drive means; a clutch operatively associated with said means for simultaneously vertically adjusting said bearings; and means for vertically adjusting one of said bearings, when said clutch is disengaged, with respect to the other also irrespective of whether or not said assembly is driven by said power drive means.

2. The brushing machine of claim 1 wherein said means for simultaneously vertically adjusting said bearings includes vertical screws rotatable, but axially fixed, in the respective stands and having threaded engagement with the respective bearings, and a reversible drive motor mounted on one stand and operatively connected with said screws.

3. The brushing machine of claim 2 wherein each stand has a pair of vertical guide bars along which the respective bearing is guided for vertical adjusting movement.

4. A machine for brushing the flat surface of work that is adapted to be fed lineally in a horizontal plane in contact with a rotary cylindrical brush, comprising a pair of upright stands between which the work is adapted to be fed, said stands being lineally offset with respect to each other, bearings vertically adjustably mounted on corresponding portions of the respective stands, a 1'0- 'tary cylindrical brush and arbor assembly extending horizontally across said stands with the ends of said arbor journalled in the respective bearings and with said brush and arbor skewed with respect to the lineal path of feed of the work, power drive means including a motor fixed with respect to said stands and a flexible drive element extending generally horizontally from said motor to said arbor, interconnected bearing adjustment means to effect simultaneous vertical adjustment of said bearings, a clutch operatively associated with said interconnected bearing adjustment means, and means for independently adjusting one bearing with respect to the other, when said clutch is disengaged, for effecting substantially uniform pressure contact of said brush with the work surface in the event that said brush has worn to generally conical profile.

5. The machine of claim 4 wherein each stand is of generally parallelogram form when viewed from the top with the inside faces generally parallel to the lineal path of feed of the work and with corresponding end faces generally parallel to the axis of said brush and arbor assembly.

6. A machine for brushing the flat surface of work that is adapted to be fed lineally in a horizontal plane in contact with a rotary cylindrical brush, comprising a pair of upright stands between which the work is adapted to be fed, said stands being lineally oifset with respect to each other, bearings vertically adjustably mounted on corresponding portions of the respective stands, a rotary cylindrical brush and arbor assembly extending horizontally across said stands with the ends of said arbor journalled in the respective bearings and with said brush and arbor skewed with respect to the lineal path of feed of the work, interconnected bearing adjustment means to effect simultaneous vertical adjustment of said bearings, a clutch operatively associated with said interconnected bearing adjustment means, and means for independently adjusting one bearing with respect to the other, when said clutch is disengaged, for effecting substantially uniform pressure contact of said brush with the work surface in the event that said brush has worn to generally conical profile.

7. A machine for brushing the flat surface of work that is adapted to be fed lineally in a horizontal plane in contact with a rotary cylindrical brush, comprising a pair of upright stands between which the work is adapted to be fed, said stands being lineally ofiset with respect to each other, bearings vertically adjustably mounted on corresponding portions of the respective stands, a rotary cylindrical brush and arbor assembly extending horizontally across said stands with the ends of said arbor journalled in the respective bearings and with said brush and arbor skewed with respect to the lineal path of feed of the work, each stand being of generally parallellogram form when viewed from the top with the inside faces generally parallel to the lineal path of feed of the work and with corresponding-end faces generally parallel to the axis of said brush and arbor assembly.

8. A brushing machine comprising a pair of upright stands each formed with a front inset portion accommodating a pair of vertical guide bars, bearings vertically slidable on the respective pairs of guide bars, downwardly extending screws rotatably, but axially fixedly,

supported in the respective stands and having threaded engagement with the respective bearings whereby said bearings are vertically adjusted by rotation of said screws, a horizontally extending brush and arbor asesrnbly journalled in said bearings, said arbor and bearings being provided with complementary spherical bearing surfaces to enable adjustment of one bearing with respect to the other, means for simultaneously rotating said screws including a beam extending across the upper portions of said stands, a shaft extending through said beam, and a power drive means mounted on one stand and operatively coupled to the screw therein, said shaft being driven by said power drive means and being operativelycoupled to the screw in the other stand, and means enabling rotation of one screw with respect to the other 10 including a clutch between said power drive means and one of said screws for rotation of the latter independently of the other of said screws when said clutch is disengaged.

9. The brushing machine of claim 8 wherein said bearings are split whereby said brush and arbor assembly may be removed from said machine upon openings of said bearings.

10. The brushing machine of claim 9 wherein said bearings are split obliquely to better handle oblique loads thereon induced by contact of said brush with work adapted to be positioned between said stands and beneath said brush.

References Cited in the file of this patent UNITED STATES PATENTS 1,097,976 Henderson May 26, 1914 1,507,596 Graves Sept. 29, 1924 1,610,374 Heichert et a1 Dec. 24, 1926 1,643,866 Welser Sept. 27, 1927 1,670,809 Hormel May 22, 1928 2,036,900 Waldron Apr. 7, 1936 2,109,687 Buckley Mar. 1, 1938 2,297,976 Nachtman Oct. 6, 1942 2,321,179 Boyer June 8, 1943 2,380,550 Reed July 31, 1945 2,800,677 Peterson July 30, 1957 FOREIGN PATENTS 438,609 Germany Dec. 21, 1926 531,510

Great Britain Jan. 6, 1941 

